Cherry-pick #15738 to 7.6: Fix mapping and race condition in sql module #15749
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Cherry-pick of PR #15738 to 7.6 branch. Original message:
Mapping was defined at the metricset level, but it should be defined at
the module level.
Add system test to earlier detect this kind of issues.
Also add validation so driver and sql_query options cannot be empty.
Fetch was reusing some maps when building the event, what was
causing mixed data in events and panics on queries with lots of rows.
Fixes #15736